The effects of nanoparticle addition on binder removal from injection molded aluminum nitride

Onbattuvelli, Valmikanathan P.; Enneti, Ravi K.; Park, Seong-Jin; Atre, Sundar V.

doi:10.1016/j.ijrmhm.2012.07.003

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…In several cases of even less resolved peaks, higher derivatives were calculated and the position of the significant points was refined. If needed, the onset temperatures were obtained from common analytical procedure employing the intersection of the horizontal line at the transition between the distinguishable steps and the tangent in the inflection point [6]. During the debinding stage three main processes are involved: evaporation, thermal degradation and oxidative degradation [17,18].…”

Section: Resultsmentioning

confidence: 99%

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Polyolefin Backbone Substitution in Binders for Low Temperature Powder Injection Moulding Feedstocks

2014

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This paper reports the substitution of polyolefin backbone binder components with low melting temperature carnauba wax for powder injection moulding applications. The effect of various binder compositions of Al 2 O 3 feedstock on thermal degradation parameters is investigated by thermogravimetric analysis. Within the experimental framework 29 original feedstock compositions were prepared and the superiority of carnauba wax over the polyethylene binder backbone was demonstrated in compositions containing polyethylene glycol as the initial opening agent and governing the proper mechanism of the degradation process. Moreover, the replacement of synthetic polymer by the natural wax contributes to an increase of environmental sustainability of modern industrial technologies.

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Section: Resultsmentioning

confidence: 99%

“…Clearly, in order to provide feedstocks tailored to the process demands, multi-component binder systems must be used. A typical binder system includes a thermoplastic polymer (polyolefin) as a backbone, waxes and processing aids [5,6].…”

Section: Introductionmentioning

confidence: 99%

Polyolefin Backbone Substitution in Binders for Low Temperature Powder Injection Moulding Feedstocks

2014

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“…Onbattuvelli et al investigated the kinetics of dewaxing a paraffin‐PP binder system in heptane solvent for monomodal and bimodal PIM, AlN, and SiC. The bimodal particle size distribution facilitated a higher solids loading in the feedstock than the conventional monomodal distribution, but also reduced the permeability of the compact and slowed the dewaxing rate slightly.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of thermal dewaxing of injection‐molded silicon carbide

Chinn

Enneti

Kate

et al. 2019

Int J Ceramic Engine & Sci

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Powder injection molding is a near-net shape, high-speed fabrication process that has been studied only lightly with silicon carbide (SiC) as the powder. The addition of nanoparticles to the monomodal powder to form a bimodal powder increases the solid fraction in the feedstock but may also adversely affect other properties. In this paper, the kinetic properties of thermally dewaxed SiC mono-and bimodal feedstocks by three models were compared to solvent-dewaxed SiC and thermally dewaxed powder metal from other studies. The activation energy E a of pyrolytic dewaxing was graphically estimated by the master dewaxing curve model as ~80 kJ/mol for monomodal and ~60 kJ/mol for bimodal SiC powder size distributions, a little higher than the ~50 kJ/mol by solvent dewaxing of the same compositions. The E a in the Flynn-Wall model was 64 kJ/mol for monomodal and 53 kJ/mol for bimodal. The E a was 49 kJ/ mol for monomodal and 42 kJ/mol for bimodal SiC powder by the Kissinger thermal analysis model. The lower E a of the bimodal feedstock was attributed to its increased nucleation sites. These results provide the basis for dewaxing models-part of the rate-limiting step in powder injection molding-for SiC powder-binder systems. K E Y W O R D Sactivation energy, dewaxing, kinetics, powder injection molding, silicon carbide 86 | CHINN et al. How to cite this article: Chinn RE, Enneti RK, Kate KH, Atre SV. Kinetics of thermal dewaxing of injection-molded silicon carbide. Int J Ceramic Eng Sci. 2019;1:85-91. https ://doi.

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“…The high hardness of the ceramics makes machining the complex parts difficult and expensive, thus, minimizing the available manufacturing options to produce the parts economically. [4][5][6][7][8] Powder injection molding (PIM), as a result of its ability and proven record of manufacturing net shape complex parts economically, is identified as a suitable choice to produce complex ceramic parts.…”

Section: Introductionmentioning

confidence: 99%

“…The use of optimized feedstocks as starting materials will enable successful processing and producing defect-free parts with enhanced properties that are required for the intended critical applications. [4][5][6][7] The emphasis on feedstock properties becomes more important as a result of the complex shape of the parts that require good flow of the materials during the mold-filling phase of PIM.…”

Section: Introductionmentioning

confidence: 99%

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

Martin

Vick

Enneti

et al. 2013

JOM

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Powder injection molding (PIM) of ceria-stabilized, zirconia-toughened mullite composites were investigated in the present article with the goal of obtaining performance enhancement in complex geometries for energy and transportation applications. A powder-polymer mixture (feedstock) was developed and characterized to determine its suitability for fabricating complex components using the PIM process. Test specimens were injection molded and subsequently debound and sintered. The sintered properties indicated suitable properties for engine component applications used in unmanned aerial vehicles (UAVs). The measured feedstock properties were used in computer simulations to assess the mold-filling behavior for a miniature turbine stator. The results from the measurements of rheological and thermal properties of the feedstock combined with the sintered properties of the ceria-stabilized, zirconia-toughened mullite strongly indicate the potential for enhancing the performance of complex geometries used in demanding operating conditions in UAV engines.

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The effects of nanoparticle addition on binder removal from injection molded aluminum nitride

Cited by 13 publications

References 23 publications

Polyolefin Backbone Substitution in Binders for Low Temperature Powder Injection Moulding Feedstocks

Polyolefin Backbone Substitution in Binders for Low Temperature Powder Injection Moulding Feedstocks

Kinetics of thermal dewaxing of injection‐molded silicon carbide

Powder Injection Molding of Ceria-Stabilized, Zirconia-Toughened Mullite Parts for UAV Engine Components

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